182. Oil analysis for a crosshead type diesel engine indicates the TBN of the crankcase lubricating oil is increasing. This is most likely associated with which of the following?

An increasing TBN in crankcase oil of a crosshead diesel engine is most likely caused by leaking stuffing boxes allowing high-TBN cylinder lubricating oil to enter the crankcase, as cylinder oil has a significantly higher TBN than crankcase oil.